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  1. Replies
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    Needing a mediocre unit for occasional work, I...

    Needing a mediocre unit for occasional work, I bought the Anesty Removal Rework Station ZD-915. The ZD-915 is sold under other manufacturer names. For $140 delivered, it works well. You can find...
  2. Let me try a zip file...

    Let me try a zip file...
  3. Fender Stage 100 Schematic... Update: Let me...

    Fender Stage 100 Schematic...

    Update: Let me try a new file without the hyphen.
  4. Replies
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    432

    One other thing to add to the must check list -...

    One other thing to add to the must check list - pull the preamp tubes and check the plate resistors. I have worked on two Hot Rod Deluxe amps and found plate resistors that were way out of tolerance...
  5. Epilog... Amp is working. C42, a 22uf, 450v...

    Epilog...

    Amp is working. C42, a 22uf, 450v cap was open. As noted above, I replaced all caps in the Power Supply with F&Ts and C65. All is good.
  6. Oh... one more thing I found ... next to the...

    Oh... one more thing I found ... next to the diodes that were swimming in goop... I thought it would be a good idea to check the fuse holders to make sure they were clean. As you can see from this...
  7. I am working on the recap. Oh my lord, glue glue...

    I am working on the recap. Oh my lord, glue glue everywhere!! I think someone on the Peavey assembly line went glue happy and they let this one through! I have been very careful to extract the...
  8. tubby... To confirm your suspicions where the...

    tubby...

    To confirm your suspicions where the problem is in the power amp section, you can run a signal directly into the Effects Return Left - that is the mono input. That point in the circuit...
  9. Epilog: For those interested, here is a copy...

    Epilog:

    For those interested, here is a copy of the schematic for the Power Supply and Amp. It's interesting to see how they modified the typical IRS2092S application to fit their needs. I can...
  10. Thanks Enzo... I looked at the board layout...

    Thanks Enzo...

    I looked at the board layout more carefully and see the Regulated Supplies go to the molex that jumps over to the preamp. I guess at first it was confusing because I saw "16"...
  11. Thank you.... I need to add some pins for the...

    Thank you....

    I need to add some pins for the plus and minus 15 volt points (off the high supply at the Zeners CR20 and CR21). Funny thing is, this came from a Peavey XR600C Mixer Amp. I have no...
  12. Update - today, the amp is working. This Class...

    Update - today, the amp is working.

    This Class D stuff sure is different. But I got a couple hints over at DIYaudio to help me look for key indicators.

    After reinstalling the Mosfets and...
  13. Peavey 400BH Module Power Supply Project

    MEF members and Visitors...

    With a day off and waiting for schematics and parts on other fixes, I finally got around to one of my projects. I had parts to a Peavey 400BH board and power...
  14. Interesting configuration... I guess Acoustic got...

    Interesting configuration... I guess Acoustic got a great deal on caps so they used two +- -+ to create a non-polar cap?
  15. There are two things you need to consider. One...

    There are two things you need to consider. One is the "value" of the cap. So if it shows 10uf, that means it is a 10 microfarad. You want that value. The second is the voltage rating. So if it...
  16. It is recommended to get "Non-Polarized"...

    It is recommended to get "Non-Polarized" capacitors. Look at the ones you have. Do you see a Plus or Minus symbol? If not, that is a good sign it is a Non-Polar cap. Did you confirm that your...
  17. Follow up to Dude's entry #8 - see photo for the...

    Follow up to Dude's entry #8 - see photo for the 2N4249 and NTE159 pin out.
  18. Back.... On the Amp board, there is a 7815...

    Back....

    On the Amp board, there is a 7815 Positive Regulator and 7915 Negative Regulator. I measured plus and minus 15 volts on the preamp board so these are ok.

    There are four devices...
  19. Thanks... I will check the output for dc and...

    Thanks...

    I will check the output for dc and will pull the heatsink to check the transistors. Will report back tonight.

    Tom
  20. Harbinger Vari V2112 Powered Monitor Speaker - No Output

    MEF Members -

    I am looking at a Harbinger Vari V2112 Powered Monitor Speaker that has no output. There is a turn on thump so we know something is getting through to the speakers, but nothing...
  21. xtian and Enzo.... Yes, after a closer...

    xtian and Enzo....

    Yes, after a closer examination, it is hardened glue. Thank goodness cause I didn't want to send it to the lab for a biopsy.

    For those visiting this thread, there are some...
  22. Peavey Delta Blues Hum - Recap and Cleanup

    MEF members:

    A friend asked me to look at his Peavey Delta Blues. The amp has a loud hum - the power supply type. We plan on replacing the caps in the Power Supply. Before doing anything else,...
  23. Here is how to calculate the voltage divider for...

    Here is how to calculate the voltage divider for each resistor:

    Across 1M: (22 volts x 1,000,000)/1,470,000 = 14.96v

    Across 470K: (22 volts x 470,000)/1,470,000 = 7.03v

    Total = 22 volts
    ...
  24. You need to be careful with too much soldering...

    You need to be careful with too much soldering (removing parts, reinstalling parts) etc.... BUT.. if it were me, I would pull the two transistors. I would then measure at the voltage point where the...
  25. This comes from another thread here on MEF ...

    This comes from another thread here on MEF

    gz34 vs 5y3 vs 5u4 - The Dynaco Tube Audio Forum

    Take a look at post #3.
  26. This might be a long shot, but contact these guys...

    This might be a long shot, but contact these guys - GH Services. They are dealers. Maybe they can shed some light... perhaps a parts list if they are a service shop too.
  27. Ok !! Is this the only place on the PC board...

    Ok !!

    Is this the only place on the PC board where you see those diodes? Could there be others you can look at?
  28. Ok... sorry... I have heard of the P6KE series...

    Ok... sorry...

    I have heard of the P6KE series (where the 6 and K are in reverse order). So perhaps that is my confusion.

    There is such a thing as the P6KE 100A diode. There are others in the...
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